c
b
a
X
a
a
b
b
c
c
X
a
X
e
b
X
e
c
X
e
2.2
c
b
a
X
a
b
b
c
c
X
c
b
a
X
c
X
c
b
a
X
c
c
X
c
b
a
X
b
b
c
c
X
c
b
a
X
a
a
b
b
c
c
X
c
b
a
X
b
c
c
X
true
c
b
a
X
c
X
c
b
a
X
c
c
X
true
2
1
a
1
0
1
0
0
1
1
1
b
1
0
0
1
1
1
1
0
c
1
0
1
0
1
1
1
18524
c
1
1
0
0
0
1
0
0
e
0
1
0
a
1
0
0
b
1
0
0
c
X
e
c
b
a
X
a
a
b
b
c
c
X
b
X
e
a
X
e
c
b
a
X
a
a
b
b
c
c
X
false
c
b
a
X
b
b
c
c
X
false
c
b
a
X
b
c
c
X
false
c
b
a
X
a
b
b
c
c
X
false
NaTT
certifiable-1.6